EM Test VDS 200N Voltage Drop Simulator

The purpose of ISO 7637-2 is to ensure electromagnetic compatibility of passenger and commercial vehicles operating on 12V or 24V electrical systems. ISO 7637-2 requires multiple conducted transients to be coupled onto DC lines to test the compatibility of vehicles. This standard is applicable to both internal combustion engine and electric motor vehicles.   Equipment Required: Transient Generator - HILO CAR TEST 14 Oscilloscope - Tektronix MDO4104C Differential Probe - Probe Master 4234 ISO 7637-2 Test Pulses The following tables show data that highlights Pulse 1, Pulse 2a, Pulse 2b, Pulse 3a, and Pulse 3b. Pulse 1 ISO 7637-2 Pulse 1 is used to simulate the transients created in the case that a motor, or inductive load, is disconnected from the circuit.    Parameters of this pulse can be verified using an oscilloscope and differential probe to meet the specifications below. Pulse 2a ISO 7637-2 Pulse 2a is used to simulate transients that occur when there is a current interruption on a device in parallel with the DUT and caused by the wiring harness inductance. Pulse 2b ISO 7637-2 Pulse 2b is used to simulate transients when a vehicle is turned off, but electric DC motors remain active and serve as a generator. Pulse 3a The pulse 3a is similar to an EFT pulse as seen in IEC 61000-4-4 (HYPERLINK THIS), this transient waveform is simulating switching occuring in a system connected by a wiring harness, in which the load is capacitive or inductive. Pulse 3b Similar to pulse 3a, except opposite polarity. Pulse 3b is another EFT waveform representing switching within a wire harness. These pulses also simulate the scenario in which a fuse is blown.   Pulse 4, 5a, & 5b ISO 7637 Pulse 4, Pulse 5a/5b were removed from the most recent revision of ISO 7637-2 and can be found now in ISO 16750-2.   ISO 7637-2 Test Equipment ATEC recommends the following products for testing

This joint engineering standard defines the electrical performance requirements for electrical and electronic components used in DaimlerChrysler vehicles and applies to all electrical and electronic components designed for 12 V nominal voltage that reference this standard. The purpose of this joint engineering standard is to ensure compatibility between the vehicle electrical power system and the electrical and electronic components in the vehicle. To support this, component requirements and tests are defined in this standard. The purpose of component testing is qualification of components from the supplier to meet vehicle requirements at a time when representative vehicles are not yet available. Deviations from the requirements contained in this standard are only allowed if agreed to explicitly and documented between the supplier and the appropriate DaimlerChrysler design and release area. The deviations are applicable only to the vehicle line(s) as specified in the individual part standard and/or detail part drawing as released by DaimlerChrysler. Any exceptions to the requirements of this standard shall be reviewed and approved by the DaimlerChrysler releasing engineer. This information shall also be transmitted to the responsible electrical system or powernet group. Satisfactory performance in a vehicle is required for final approval of the vehicle component or system. It is the supplier’s responsibility to ensure that the current edition of this standard is used.